Sericominolia safrocincta, Herbert, 2024

Herbert, David G., 2024, The Umboniinae (Mollusca: Gastropoda: Trochidae) of New Caledonia, with descriptions of two new genera and eight new species, plus an additional new species from the Bismarck Sea, European Journal of Taxonomy 973, pp. 1-143 : 68-71

publication ID	https://doi.org/ 10.5852/ejt.2024.973.2765
publication LSID	lsid:zoobank.org:pub:524B5B20-A190-4023-AC2B-7B48A725930A
persistent identifier	https://treatment.plazi.org/id/714FF54E-3719-3221-FDBF-FEF9FD74FC9A
treatment provided by	Plazi
scientific name	Sericominolia safrocincta
status	sp. nov.

Treatment

Sericominolia safrocincta sp. nov.

urn:lsid:zoobank.org:act:D3F3F410-21ED-45DA-8F01-33337D121700

Figs 32–33 View Fig View Fig

Diagnosis

Shell thin, diameter up to 9.0 mm, apex low and spire profile bluntly rounded; periphery weakly angled; base umbilicate; sculpture fine, predominantly spiral, comprising low, close-set, spiral lirae separated by narrower, incised striae; later whorls also with fine, close-set, collabral pliculae; umbilicus with rounded, thickened rim, at most a very low funicle within; colour pattern mottled and with fine capillary lines dotted with opaque white flecks; umbilicus white, with broad saffron-yellow band within.

Etymology

From the Arabic ‘ safra ’, yellow, saffron, and the Latin ‘ cinctum ’, a girdle or belt; in reference to the saffron-yellow band in the umbilicus.

Material examined

Holotype ( Fig. 32A–D View Fig )

NEW CALEDONIA • empty shell; Bellona Plateau, Stn D 58; 21°34.6′ S, 159°18.9′ E; depth 56 m; Jul. 1984; CHALCAL 1 leg.; MNHN-IM-2000-38851 GoogleMaps .

Paratypes

NEW CALEDONIA – Chesterfield Plateau • 1 specimen, dead; Stn DW128; 19°28′ S, 158°30′ E; depth 38 m; 29 Jul. 1988; NO Coriolis -CORAIL 2 leg.; MNHN-IM-2000-38852 GoogleMaps • 1 specimen, dead; Stn DW154; 19°52′ S, 158°27′ E; depth 35 m; 1 Aug. 1988; NO Coriolis -CORAIL 2 leg.; MNHN- IM-2000-38853 GoogleMaps . – Grande Terre • 1 specimen, living; Grand Récif de Koumac, Stn KL03; 20°40.5′ S, 164°12.9′ E; depth 50 m; 15 Sep. 2018 – 11 Nov. 2019; KOUMAC 2.3 leg.; pente externe de récif barrière, lumun-lumun; DNA voucher, photographed alive (image LC482 ); MNHN IM-2019-8540 GoogleMaps • 1 specimen, living; same collection data as for preceding; MNHN-IM-2000-38854 GoogleMaps • 1 specimen, living; Grand Récif de Koumac, Stn 1318; 20°41.4′ S, 164°14.8′ E; depth 20–30 m; Oct. 1993; Expédition Montrouzier leg.; pente externe; MNHN-IM-2000-38855 GoogleMaps • 1 specimen, dead; Nouméa, Passe de Dumbéa, Stn 1339; 22°21.9′ S, 166°15.4′ E; depth 20 m; 17 Aug. 1992; P. Bouchet leg.; tombant récifal; MNHN- IM-2000-38856 GoogleMaps • 1 specimen, living; Yaté, Stn 597B; 22°00′ S, 167°04′ E; depth 50–70 m; 5 Aug. 1986; B. Richer-ORSTOM leg.; MNHN-IM-2000-38857 GoogleMaps .

Other material

NEW CALEDONIA – Plateau Chesterfield-Bellona • 2 specimens, dead; Plateau Chesterfield-Bellona, Stn D26; 19°10.72′ S, 158°34.95′ E; depth 48 m; Jul. 1984; CHALCAL 1 leg.; MNHN GoogleMaps • 1 specimen, dead; Plateau des Chesterfield, Stn DW38; 19°22′ S, 158°43′ E; depth 61 m; 23 Jul. 1988; NO Coriolis -CORAIL 2 leg.; MNHN GoogleMaps • 1 specimen, dead; Plateau des Chesterfield, Stn DW82; 19°12′ S, 158°50′ E; depth 62 m; 25 Jul. 1988; NO Coriolis -CORAIL 2 leg.; MNHN GoogleMaps • 1 specimen, dead; Stn D62; 21°46.60′ S, 159°30.70′ E; depth 40 m; 26 Jul. 1984; CHALCAL 1 leg.; MNHN GoogleMaps . – Lansdowne-Fairway Banks • 4 specimens, dead; Bancs Lansdowne–Fairway, Stn DW26; 20°22′ S, 161°05′ E; depth 62 m; 22 Jul. 1988; NO Coriolis -CORAIL 2 leg.; MNHN GoogleMaps . – Grande Terre, Koumac • 1 specimen, dead; Grand Récif de Koumac, Stn KL22; 20°26.8′ S, 163°58.3′ E; depth 47 m; 16 Sep. 2018 – 19 Nov. 2019; KOUMAC 2.3 leg.; lumun-lumun, pente externe de récif barrière; MNHN GoogleMaps • 12 specimens, dead; Grand Récif de Koumac, Stn 1331; 20°40.0′ S, 164°11.2′ E; depth 55–57 m; Oct. 1993; Expédition Montrouzier leg.; pente externe; MNHN SEM GoogleMaps • 2 specimens, dead; Grand Récif de Koumac, Stn 1333; 20°40.0′ S, 164°11.2′ E; depth 30–60 m; Oct. 1993; Expédition Montrouzier leg.; pente externe; MNHN GoogleMaps • 1 specimen, living; Grand Récif de Koumac, Stn KL25; 20°45.3′ S, 164°13.8′ E; depth 65 m; 16 Sep. 2018 – 10 Nov. 2019; KOUMAC 2.3 leg.; pente externe de récif barrière, lumun-lumun; MNHN GoogleMaps • 2 specimens, dead; Chenal de la Passe de Koumac, Stn 1323; 20°40.9′ S, 164°14.8′ E; depth 82–120 m; Oct. 1993; Expédition Montrouzier leg.; sable coquillier vaseux; MNHN GoogleMaps • 1 specimen, dead; Passe de Koumac, Stn 1311; 20°40.4′ S, 164°14.9′ E; depth 10–60 m; Oct. 1993; Expédition Montrouzier leg.; fonds dur; MNHN GoogleMaps • 3 specimens, dead; Passe de Koumac, east drop-off, Stn 1312; 20°40.4′ S, 164°14.9′ E; depth 26–40 m; Oct. 1993; Expédition Montrouzier leg.; suceuse fonds durs; MNHN GoogleMaps • 2 specimens, living; Stn KB649; 20°48.4′ S, 164°16.1′ E; depth 42 m; 18 Nov. 2019; KOUMAC 2.3 leg.; pente externe de récif barrière; MNHN GoogleMaps . – Grande Terre, Nouméa • 1 specimen, dead; Canyon de la Dumbéa, Stn 1356; 22°19.7′ S, 166°15.4′ E; depth 20–23 m; 4 Dec. 1992; Bouchet and Marshall leg.; sable sous blocs; MNHN. – Loyalty Islands GoogleMaps • 1 specimen, dead; Lifou, Baie du Santal, off Cap Lefèvre [=Nem], Stn 1469; 20°54.2′ S, 167°00.4′ E; depth 70–130 m; 23 Nov. 2000; Atelier LIFOU 2000 leg.; dragages; MNHN GoogleMaps .

Description ( Fig. 32 View Fig )

SHELL. Thin, of moderate size (adult diameter up to 9.0 mm), wider than high (H/D 0.69–0.77); apex low and spire profile bluntly rounded, periphery below mid-whorl, weakly angled; suture indented but not strongly so; sculpture fine, predominantly spiral; base rounded, umbilicate; teleoconch of up to 5.25 whorls. First teleoconch whorl with three narrow spiral lirae, broadening during second whorl and increasing in number through intercalation of intermediaries; subsequent sculpture of low, close-set, spiral lirae separated by narrower, incised striae; lirae finer below suture; axial sculpture initially weak, close-set microscopic threads only, later whorls with stronger, close-set, collabral growth-lines, most distinct below suture; basal sculpture similar, but lirae narrower and with wider intervals; lirae more numerous around and within umbilicus; axial sculpture of base weak peripherally, strengthening medially to form fine, close-set pliculae around umbilicus; umbilical rim rounded, steep-sided within, without a funicle or with at most a very low one, above which is a shallow sulcus underlying insertion onto preceding whorl ( Fig. 32D View Fig ). Aperture obliquely quadrate; peristome interrupted in parietal region; columella lip thickened and with surface microscopically granular at termination of umbilical rim, weakly reflected at end of umbilical funicle when present; outer lip simple; interior smooth and weakly nacreous.

COLOUR. Pattern variable; usually finely mottled in shades of pale apricot, pink, or olive-green with fine capillary lines dotted with alternating opaque white and olive-green flecks; periphery usually with a broad whitish band with olive-green blotches; peri-umbilical region white, interior of umbilicus with a broad, saffron-yellow band; some specimens banded or blotched and others more uniformly coloured in pink to orange-red hues ( Fig. 32G View Fig ); protoconch usually whitish.

DIMENSIONS. Holotype, height 5.5 mm, diameter 7.5 mm; largest specimen, diameter 9.0 mm.

PROTOCONCH. As in S. lifuana , diameter 190–200 µm.

OPERCULUM. AS in S. lifuana .

RADULA AND EXTERNAL ANATOMY. Not examined.

Habitat

Mostly found in the deeper lagoon channels and passes, and on the outer slope of the barrier reef, at depths of 20–70 m (living specimens, 30–65 m).

Distribution ( Fig. 33 View Fig )

Known only from the New Caledonian marine ecoregion, ranging from the Chesterfield-Bellona Plateau and Lansdowne-Fairway Banks, to Grande Terre and the Loyalty Islands.

Remarks

Very similar to Sericominolia lifuana , but differs therefrom in having a more bluntly rounded apex, a broad saffron-yellow band in the umbilicus and at most a weak umbilical funicle that does not project into the umbilicus at the columella lip.